.rvc,
.rvc * {
    box-sizing: border-box;
}

.rvc {
    --rvc-bg: #ffffff;
    --rvc-soft: #f6f3ef;
    --rvc-soft-2: #fbfaf8;
    --rvc-border: #e5ded6;
    --rvc-text: #211b17;
    --rvc-muted: #776d64;
    --rvc-strong: #6d4d34;
    --rvc-accent: #9b6a45;
    --rvc-accent-soft: #ead8c9;
    --rvc-warning-bg: #fff6de;
    --rvc-warning-border: #f0c56c;
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    color: var(--rvc-text);
    font-family: inherit;
}

.rvc__head {
    padding: 28px;
    margin-bottom: 18px;
    border: 1px solid var(--rvc-border);
    border-radius: 24px;
    background: linear-gradient(135deg, var(--rvc-soft), var(--rvc-bg));
}

.rvc__eyebrow {
    margin: 0 0 8px;
    color: var(--rvc-accent);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.rvc__title {
    margin: 0 0 10px;
    font-size: clamp(26px, 4vw, 42px);
    line-height: 1.12;
}

.rvc__lead {
    max-width: 800px;
    margin: 0;
    color: var(--rvc-muted);
    font-size: 17px;
    line-height: 1.55;
}

.rvc__form,
.rvc__result {
    display: grid;
    gap: 18px;
}

.rvc__panel,
.rvc__summary-card,
.rvc__layout-wrap,
.rvc__details {
    border: 1px solid var(--rvc-border);
    border-radius: 22px;
    background: var(--rvc-bg);
    box-shadow: 0 10px 30px rgba(72, 52, 35, .06);
}

.rvc__panel,
.rvc__layout-wrap,
.rvc__details {
    padding: 20px;
}

.rvc__panel--main {
    background: var(--rvc-soft-2);
}

.rvc__panel-head,
.rvc__explain-head,
.rvc__layout-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 16px;
}

.rvc__panel-title,
.rvc__layout-head h3,
.rvc__details h3,
.rvc__explain-head h3 {
    margin: 0;
    font-size: 20px;
    line-height: 1.25;
}

.rvc__panel-head p,
.rvc__explain-head p,
.rvc__layout-head p {
    max-width: 560px;
    margin: 0;
    color: var(--rvc-muted);
    font-size: 14px;
    line-height: 1.45;
}

.rvc__shape-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 16px;
}

.rvc__shape {
    display: flex;
    min-height: 54px;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--rvc-border);
    border-radius: 18px;
    background: #fff;
    color: var(--rvc-strong);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
    transition: border-color .15s ease, background-color .15s ease, transform .15s ease, box-shadow .15s ease;
}

.rvc__shape:hover,
.rvc__shape:focus-visible,
.rvc__shape.is-active {
    border-color: var(--rvc-accent);
    background: var(--rvc-accent-soft);
    box-shadow: 0 8px 18px rgba(109, 77, 52, .08);
}

.rvc__shape:active {
    transform: translateY(1px);
}

.rvc__shape-icon {
    display: inline-block;
    width: 26px;
    height: 26px;
    border: 2px solid currentColor;
    opacity: .8;
}

.rvc__shape-icon--circle {
    border-radius: 50%;
}

.rvc__shape-icon--rect {
    border-radius: 7px;
}

.rvc__shape-icon--cylinder {
    position: relative;
    border-radius: 50% / 18%;
}

.rvc__shape-icon--cylinder::after {
    content: "";
    position: absolute;
    left: -2px;
    right: -2px;
    top: 7px;
    height: 14px;
    border-left: 2px solid currentColor;
    border-right: 2px solid currentColor;
}

.rvc__grid {
    display: grid;
    gap: 14px;
}

.rvc__grid--main,
.rvc__grid--mix {
    grid-template-columns: repeat(4, minmax(140px, 1fr));
}

.rvc__field {
    display: grid;
    gap: 7px;
}

.rvc__field.is-hidden {
    display: none;
}

.rvc__field span {
    color: var(--rvc-muted);
    font-size: 13px;
    line-height: 1.25;
}

.rvc__field input {
    width: 100%;
    min-height: 44px;
    padding: 9px 12px;
    border: 1px solid var(--rvc-border);
    border-radius: 14px;
    background: #fff;
    color: var(--rvc-text);
    font: inherit;
    outline: none;
    transition: border-color .15s ease, box-shadow .15s ease;
}

.rvc__field input:focus {
    border-color: var(--rvc-accent);
    box-shadow: 0 0 0 4px rgba(155, 106, 69, .13);
}

.rvc__quick {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-top: 14px;
}

.rvc__quick span {
    color: var(--rvc-muted);
    font-size: 13px;
    font-weight: 700;
}

.rvc__quick button {
    min-height: 36px;
    padding: 7px 12px;
    border: 1px solid var(--rvc-border);
    border-radius: 999px;
    background: #fff;
    color: var(--rvc-strong);
    font: inherit;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
    transition: border-color .15s ease, background-color .15s ease, transform .15s ease;
}

.rvc__quick button:hover,
.rvc__quick button:focus-visible {
    border-color: var(--rvc-accent);
    background: var(--rvc-accent-soft);
}

.rvc__quick button:active {
    transform: translateY(1px);
}

.rvc__summary {
    display: grid;
    grid-template-columns: 1.25fr 1fr 1fr;
    gap: 16px;
    margin-top: 18px;
}

.rvc__summary-card {
    display: grid;
    gap: 5px;
    padding: 18px;
}

.rvc__summary-card--primary {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(135deg, #7a5033, #b9835b);
}

.rvc__summary-card span {
    color: inherit;
    opacity: .78;
    font-size: 14px;
}

.rvc__summary-card strong {
    font-size: clamp(25px, 4vw, 40px);
    line-height: 1;
}

.rvc__summary-card small {
    color: inherit;
    opacity: .72;
    font-size: 13px;
}

.rvc__warnings {
    padding: 14px 16px;
    border: 1px solid var(--rvc-warning-border);
    border-radius: 18px;
    background: var(--rvc-warning-bg);
    color: #6e4a0a;
    line-height: 1.5;
}

.rvc__warnings p {
    margin: 0;
}

.rvc__warnings p + p {
    margin-top: 7px;
}

.rvc__facts {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.rvc__fact {
    display: grid;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--rvc-border);
    border-radius: 18px;
    background: var(--rvc-soft-2);
}

.rvc__fact span {
    color: var(--rvc-muted);
    font-size: 13px;
    line-height: 1.3;
}

.rvc__fact strong {
    color: var(--rvc-strong);
    font-size: 20px;
    line-height: 1.1;
}

.rvc__visual {
    display: grid;
    grid-template-columns: minmax(180px, 360px) 1fr;
    align-items: center;
    gap: 18px;
    min-height: 180px;
    padding: 18px;
    border: 1px solid var(--rvc-border);
    border-radius: 18px;
    background:
        radial-gradient(circle at 30% 20%, rgba(234, 216, 201, .75), transparent 32%),
        linear-gradient(135deg, #fffdfb, var(--rvc-soft-2));
    overflow: hidden;
}

.rvc__visual-shape {
    position: relative;
    display: block;
    width: min(100%, 260px);
    aspect-ratio: 1 / 1;
    margin: 0 auto;
    border: 2px solid rgba(109, 77, 52, .35);
    background: linear-gradient(135deg, rgba(185, 131, 91, .26), rgba(255, 255, 255, .72));
    box-shadow: inset 0 -24px 40px rgba(155, 106, 69, .10);
}

.rvc__visual-shape::before,
.rvc__visual-shape::after {
    content: "";
    position: absolute;
    pointer-events: none;
}

.rvc__visual-shape::before {
    inset: 12%;
    border: 1px dashed rgba(109, 77, 52, .35);
}

.rvc__visual-shape::after {
    left: 14%;
    right: 14%;
    bottom: 18%;
    height: 18%;
    border-radius: 999px;
    background: rgba(155, 106, 69, .18);
}

.rvc__visual-shape--circle {
    border-radius: 50%;
}

.rvc__visual-shape--circle::before {
    border-radius: 50%;
}

.rvc__visual-shape--rect {
    aspect-ratio: 1.35 / 1;
    border-radius: 18px;
}

.rvc__visual-shape--rect::before {
    border-radius: 12px;
}

.rvc__visual-shape--cylinder {
    aspect-ratio: 1 / 1.15;
    border-radius: 50% / 12%;
}

.rvc__visual-shape--cylinder::before {
    left: 9%;
    right: 9%;
    top: 8%;
    bottom: 8%;
    border-radius: 50% / 12%;
}

.rvc__visual-info {
    display: grid;
    gap: 8px;
}

.rvc__visual-info span {
    color: var(--rvc-muted);
    font-size: 14px;
}

.rvc__visual-info strong {
    color: var(--rvc-strong);
    font-size: clamp(28px, 5vw, 48px);
    line-height: 1;
}

.rvc__visual-info small {
    color: var(--rvc-muted);
    font-size: 15px;
}

.rvc__details-list {
    display: grid;
    gap: 10px;
}

.rvc__detail {
    padding: 12px 0;
    border-bottom: 1px solid var(--rvc-border);
}

.rvc__detail:last-child {
    border-bottom: 0;
}

.rvc__detail span {
    display: block;
    color: var(--rvc-muted);
    font-size: 14px;
    line-height: 1.45;
}

@media (max-width: 980px) {
    .rvc__grid--main,
    .rvc__grid--mix {
        grid-template-columns: repeat(2, minmax(130px, 1fr));
    }

    .rvc__summary,
    .rvc__facts {
        grid-template-columns: 1fr 1fr;
    }

    .rvc__visual {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    .rvc__head,
    .rvc__panel,
    .rvc__layout-wrap,
    .rvc__details {
        border-radius: 18px;
        padding: 16px;
    }

    .rvc__lead {
        font-size: 15px;
    }

    .rvc__panel-head,
    .rvc__explain-head,
    .rvc__layout-head {
        display: grid;
        justify-content: stretch;
    }

    .rvc__shape-tabs,
    .rvc__grid--main,
    .rvc__grid--mix,
    .rvc__summary,
    .rvc__facts {
        grid-template-columns: 1fr;
    }

    .rvc__quick {
        display: grid;
        grid-template-columns: 1fr;
        align-items: stretch;
    }

    .rvc__quick button,
    .rvc__shape {
        width: 100%;
        text-align: center;
    }

    .rvc__visual {
        min-height: 0;
        padding: 14px;
    }

    .rvc__visual-shape {
        max-width: 210px;
    }
}